designed and developed solutions and services integrated with Ericsson Billing System (BSCS).• Designed and developed new bill presentment middleware using Java, Spring, and Oracle database for the BSCS Billing System and KSL Suite Project, replacing the old one and cutting the process time from 8 to 4 hours without missing any invoices, unlike the old system which missed 30%.• Designed and developed a dunning and collection system (DCMS) implementing functionalities for dunning, reactivation, and notifications for telecom customers using Spring Data, Spring Security, RabbitMQ, JSF and Oracle Database, increasing revenue and decreasing the number of deactivated customers.• Designed and developed a bad debt management system (BDMS) for telecom companies using Spring Data, Spring Security, JSF and Oracle Database, enhancing collection of bad debts.• Developed the Migration Tool Project using Java and Oracle database, facilitating the seamless transition of customers from the Siebel Billing System to the BSCS Billing System.• Oversaw and tracked the status and availability of the Dunning and Collection Management System (DCMS).

• Designed and developed middleware utilizing Oracle Forms/Reports, Java, JSF, and Oracle database to supervise the distribution and collection of customer invoices, as well as the management of customer addresses, Enabled efficient supervision of the distribution and collection of customer invoices.• Devised the architectural framework for the handheld application focused on the distribution and collection of customer invoices, established a robust foundation for the handheld application, ensuring scalability and effectiveness in handling invoice-related processes. • Implemented E-courier Tracking system to monitor the invoice distribution and develop the integration with the distribution and collection middleware, ensuring a cohesive and interconnected workflow.• Developed a handheld application dedicated to gathering customer addresses using VB.Net and delivered a successful application that significantly contributed to the optimization of customer address management.

- Developed Archiving System.- Building and designing the architecture for new projects and APIs.- Working on performance enhancement and tuning.- Oracle development (Design, Programming, Implement & Testing).- Responsible for the software lifecycle from analysis, design, development and testing of software prior to installation.

- Oracle development (Design, Programming, Implement & Testing).- Responsible for the software lifecycle from analysis, design, development and testing of software prior to installation.- Designed and developed new requirement of the Billing System (Collection & Distribution) for Telecom operators (Dealing with large Data) and other projects.- Responsible for the software demands of new customers.- Applications Administrator ( open bills cycle to collection or distribution, follow cycle to end and repair any exceptions or special cases need to administrator privileges).- Pocket PC Application development using C#, VB.Net, Oracle Lite and SQLite.- Excel Reporting using Macros and Oracle.